/**
 * Copyright 2005 SIB Framework

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
package org.sibframework.sda;

/**
 * Visitor to use visit pattern in result iterator.
 * @author Spring Song
 *
 */
public interface ResultVisitor {
	/**
	 * initial the visitor with columns
	 * @param columns
	 * @throws Exception
	 */
	public void column(String[] columns);
	/**
	 * call when rs.next();
	 * @throws Exception
	 */
	public void next();
	
	/**
	 * call when rs.get(i)
	 * @param name column name
	 * @param value data value
	 * @throws Exception
	 */
	public void data(String name, Object value);
	
	/**
	 * call when finish
	 * @throws Exception
	 */
	public void finish();
}
